| 摘要 |
The present invention relates to an extended tooth contact harmonic drive gearing apparatus (10) for transmitting rotary motion from an input drive to an output drive, through mating contact between the gear tooth (30, 60; 32, 62) of a flexspline (26) and a rigid circular spline (28) respectively, the flexspline being deformed into non-circular shape by a wave generator (12). Rotation of the wave generator relative to the flexspline causes relative rotation between the flexspline and circular spline. The profile of the teeth (60) of the flexspline (26) is generated to cause the teeth (60) to contact more than one tooth (62) of the circular spline (28) by forming a face profile (60A, 60B, 60C) on the flexspline teeth in accordance with a predetermined equation while the tooth flank profile (62A) of the circular spline is formed of a known arc segment, such as, a circle, ellipse or parabola. <IMAGE> |
